WO2012097611A1 - 一种光网络自动保护倒换方法及装置 - Google Patents

一种光网络自动保护倒换方法及装置 Download PDF

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Publication number
WO2012097611A1
WO2012097611A1 PCT/CN2011/080639 CN2011080639W WO2012097611A1 WO 2012097611 A1 WO2012097611 A1 WO 2012097611A1 CN 2011080639 W CN2011080639 W CN 2011080639W WO 2012097611 A1 WO2012097611 A1 WO 2012097611A1
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Prior art keywords
channel
working
switching
protection
working channel
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PCT/CN2011/080639
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English (en)
French (fr)
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王磊
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中兴通讯股份有限公司
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Publication of WO2012097611A1 publication Critical patent/WO2012097611A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/03Arrangements for fault recovery
    • H04B10/032Arrangements for fault recovery using working and protection systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/079Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
    • H04B10/0795Performance monitoring; Measurement of transmission parameters
    • H04B10/07955Monitoring or measuring power

Definitions

  • the present invention relates to the field of optical communication technologies, and in particular, to an optical network automatic protection switching method and apparatus. Background technique
  • optical network protection is very important.
  • the working channel and the protection channel can be configured to transmit services at the same time.
  • the system automatically selects the protection channel to continue the transmission service, thereby ensuring that the communication link is not interrupted.
  • FIG. 1 is a schematic diagram of an optical network automatic protection switching principle.
  • an optical signal for loading a service is divided into two channels by a splitter: one is a working channel, and the other is a protection channel;
  • the receiving unit selects one of the channels for receiving.
  • the detection control unit completes the detection of the optical power of the two channels and the control of the receiving unit.
  • the working channel and the protection channel transmit the service at the same time, and the receiving unit selects the working channel to receive; when the working channel fails, the detecting control unit detects that the working channel has no light, and then issues a switching command to automatically switch the receiving unit.
  • To the protection channel to ensure that the communication link is not interrupted due to the failure of the working channel.
  • the core of the automatic protection switching device is the detection control unit.
  • the basic method of detecting the control unit is to detect whether the working channel and the protection channel are abnormal. If the working channel is abnormal and the protection channel is normal, it is switched to the protection channel. Summary of the invention
  • the technical problem to be solved by the present invention is to provide an optical network automatic protection switching method and device, which can realize flexible switching of channels and optimize system performance.
  • the present invention provides an optical network automatic protection switching method, where the method includes:
  • the switching triggering condition includes:
  • the signal strength of the protection channel is greater than the signal strength of the working channel, and the difference between the signal strength of the protection channel and the signal strength of the working channel is 'J scheduled conversion threshold.
  • the signal strength comprises an optical power value
  • the predetermined switching width is a relative optical power threshold.
  • the above method further includes:
  • the switching triggering condition further includes:
  • the signal strength of the working channel is less than a predetermined threshold, and the signal strength of the protection channel is greater than a predetermined threshold.
  • the method further includes:
  • the present invention also provides an optical network automatic protection switching device, the device comprising: a detecting module, configured to: detect a signal strength of a working channel and a protection channel of the optical network; and a first comparing unit, configured to: Whether the working channel and the protection channel are working properly;
  • a second comparing unit configured to: when the working channel and the protection channel of the optical network work normally, compare the detected signal strengths of the working channel and the protection channel; and a control module, where: According to the comparison result of the second comparison unit, when the switching trigger condition is satisfied, the switching is performed.
  • control module is configured to determine, according to the comparison result of the second comparison unit, whether the following trigger trigger condition is met: the signal strength of the protection channel is greater than the signal strength of the working channel, and the protection The difference between the signal strength of the channel and the signal strength of the working channel Reach the predetermined switching threshold;
  • the signal strength includes an optical power value; and the predetermined switching threshold is a relative optical power threshold.
  • the first comparing unit is configured to determine whether the working channel and the protection channel are working normally by:
  • control module is further configured to determine, according to the determination result of the first comparison unit, whether the following trigger trigger condition is met: the signal strength of the working channel is less than a predetermined threshold, and the signal of the protection channel The intensity is greater than the predetermined threshold.
  • the detecting module is further configured to detect whether the transmitting end has no optical signal
  • the control module is further configured to not perform any switching if a no-light signal is detected at the transmitting end.
  • the above solution is to set two comparison units, the first comparison unit completes the comparison between the optical power value of the two channels and the optical power threshold, and is used for detecting whether the working channel and the protection channel are working normally, the second comparison channel performance comparison, and the protection channel
  • the automatic switching of the working channel to the protection channel is realized when the power value exceeds the working channel to reach the trigger condition.
  • the optical power value is completed by the high-speed A/D unit, which complements the comparison unit circuit.
  • the optical power of the transmitting unit is also monitored by the transmitting unit. If the optical power entering the transmitting unit is lower than the normal value, it indicates that a fault occurs in the upstream of the protected line, and the protection segment will not perform any switching action. . BRIEF abstract
  • FIG. 1 is a schematic diagram of an optical network automatic protection switching principle
  • FIG. 2 is a schematic diagram of a composition of an optical network automatic protection switching device according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a composition of an optical network automatic protection switching device according to an application example of the present invention.
  • An embodiment of the present invention provides an optical network automatic protection switching mechanism: when both the working channel and the protection channel are normal, the receiving end detects and compares the performance of the two channels, and adaptively selects the performance of the two channels.
  • the channel acts as a working channel, that is, if the performance of the protection channel is better than that of the working channel, then switching is performed.
  • the optical network automatic protection switching method of the embodiment of the present invention uses the following technical solutions: respectively detecting the signal strength of the working channel and the protection channel of the optical network;
  • switching is performed when the switching trigger condition is satisfied.
  • the switching triggering conditions include:
  • the signal strength of the protection channel is greater than the signal strength of the working channel, and the difference between the signal strength of the protection channel and the signal strength of the working channel reaches a predetermined value. Reverse the threshold.
  • the signal strength comprises an optical power value
  • the predetermined switching width is a relative optical power threshold.
  • the switching triggering condition further includes:
  • the signal strength of the working channel is less than a predetermined threshold, and the signal strength of the protection channel is greater than a predetermined threshold.
  • the method further includes:
  • the optical network automatic protection switching device of the embodiment of the present invention mainly includes: a detecting module, a first comparing unit, a second comparing unit and a control module, and a high speed collecting unit.
  • the detection module is configured to detect signal strengths of the working channel and the protection channel, such as optical power values.
  • the first comparison unit is configured to complete the comparison between the optical power values of the two channels and the threshold. If the value is higher than the threshold, the channel is determined to be working normally. Otherwise, the channel is determined to be abnormal.
  • the control module performs switching, and the control receiving unit selects the protection channel to receive;
  • the second comparison unit is configured to compare the difference between the two channels and the relative threshold. If it is determined that the performance of the working channel is degraded, and the switching trigger condition is met (for example, the optical power of the working channel is low and the difference from the protection channel is greater than the optical power) The threshold value, then the control module will also perform the switching, and the control receiving unit selects the protection channel to receive. It can be seen that the comparison result of the second comparison unit is valid only under the condition that the first comparison unit judges that both channels are working normally.
  • the high-speed concentrating unit is set to complete the sampling and calculation of the optical power, and the part and the comparison unit complement each other to improve the survivability and reliability of the system.
  • the detection module is further configured to detect whether the transmitting end has no optical signal, and if performing a signal that detects no light, no switching is performed.
  • FIG. 3 shows an optical network automatic protection switching device according to an application example of the present invention.
  • the detection module is configured to detect a channel optical power value, for example, a 5/95 coupler can be used to detect the optical power of a 5% signal.
  • the detection module of the present example includes a first detection unit and a second detection unit, wherein the first detection unit is configured to detect an optical power value of the working channel; and the second detection unit is configured to detect an optical power value of the protection channel.
  • the first comparison unit is composed of a comparator and an optical power threshold
  • the second comparison unit is composed of a subtractor, a comparator, and a relative optical power threshold.
  • the first comparison unit is configured to determine, by the comparator, whether the detected optical power value is greater than a predetermined optical power threshold, to determine whether the working channel and the protection channel work normally, and send the identifier
  • the signal is sent to the control module, and the judgment result is output to the control module, and the control module determines whether the switching trigger condition is satisfied, for example, if the working channel fault causes the optical power value to be lower than the optical power threshold and the protection channel is normal, then the control receiving unit is controlled. Perform a switchover.
  • the second comparison unit is configured to compare the detected signal strengths of the working channel and the protection channel when the working channel and the protection channel of the optical network are working normally, and issue an identification signal, and output the comparison result to
  • the control module determines, by the control module, whether the triggering condition is met: if the working channel and the protection channel are both above the optical power threshold, and the optical power value of the working channel is lower and the difference between the optical power value of the protection channel is greater than the relative optical power threshold, The control module will control the receiving unit to perform the switching; if the working channel optical power value is lower, the difference between the working channel optical power value and the protection channel optical power value is less than the relative optical power threshold, or the working channel optical power value is greater than the protection channel The optical power value, then the control module will not perform the switching.
  • the detection module may further detect whether the transmitting end has no optical signal, and if yes, issue a no-light identification signal to the control module; and the control module needs to confirm whether it receives no light from the detecting unit when performing any switching.
  • the identification signal if received, does not perform any switching.
  • the high-speed gathering unit can be realized by a high-speed A/D module, which is disposed between the detecting module and the control module, and is used for converting the analog signal into a digital signal and outputting to the control module, and the control module receives the high-speed AD signal and uses the software. Calculate whether the working channel and the protection channel work normally, and complement each other with the hardware comparison circuit.
  • the high-speed A/D module can be supplemented with the comparison unit and reported to each other as a backup.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or They are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.
  • the first comparison unit completes comparison between the optical power value of the two channels and the optical power threshold, and is used to detect whether the working channel and the protection channel are working normally, and the performance of the second protection channel is compared and protected.
  • the power value of the channel exceeds the trigger condition of the working channel, the automatic switching of the working channel to the protection channel is realized.
  • the value of the optical power value is completed by the high-speed A/D unit, which complements the comparison unit circuit.
  • the optical power of the transmitting unit is also monitored by the transmitting unit. If the optical power entering the transmitting unit is lower than the normal value, it indicates that a fault occurs in the upstream of the protected line, and the protection segment will not perform any switching action. .

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

本发明公开了一种光网络自动保护倒换方法及装置,其中所述方法包括:分别检测光网络的工作通道和保护通道的信号强度;根据检测到的工作通道和保护通道的信号强度,在满足倒换触发条件时,执行倒换。本发明通过工作通道和保护通道光功率差值与相对光功率阈值的比较,对工作通道和保护通道性能进行对比,并在保护通道的功率值超出工作通道达到触发条件时,实现工作通道到保护通道的自动倒换,从而使系统工作性能达到最优。

Description

一种光网络自动保护倒换方法及装置
技术领域
本发明涉及光通信技术领域, 更具体地, 涉及一种光网络自动保护倒换 方法及装置。 背景技术
在光通讯系统中, 光缆切断、 设备失效、 或者光连接器被拔出等事故均 会导致业务中断, 因此, 光网络保护非常重要。 对于需要保护的传输段, 可 配置工作通道和保护通道两路通道同时传输业务, 当工作通道遇到故障时, 系统自动选择保护通道继续传输业务, 从而保证通信链路不会中断。
图 1示出了一种光网络自动保护倒换原理示意图, 如图 1所示, 在发送 端, 加载业务的光信号通过分光器分成两路传输: 一路为工作通道, 另一路 为保护通道; 在接收端, 接收单元选择其中一路通道进行接收。 检测控制单 元完成对两路通道光功率的检测和接收单元的控制。网络正常工作无故障时, 工作通道和保护通道同时传送业务, 接收单元选择工作通道接收; 当工作通 道发生故障时, 检测控制单元检测到工作通道无光, 则发出倒换命令, 使接 收单元自动倒换到保护通道, 从而保证通信链路不因工作通道故障而中断。
可以看出, 自动保护倒换装置的核心是检测控制单元。 但目前检测控制 单元的基本做法是检测工作通道和保护通道是否异常, 如果工作通道异常, 而保护通道正常, 则倒换到保护通道。 发明内容
本发明解决的技术问题是提供一种光网络自动保护倒换方法及装置, 能 够实现通道的灵活倒换, 使系统工作性能达到最优。
为解决上述技术问题, 本发明提供了一种光网络自动保护倒换方法, 所 述方法包括:
分别检测光网络的工作通道和保护通道的信号强度; 根据检测到的所述工作通道和所述保护通道的信号强度, 在满足倒换触 发条件时, 执行倒换。
较佳的, 所述倒换触发条件包括:
所述工作通道和所述保护通道均工作正常时, 所述保护通道的信号强度 大于所述工作通道的信号强度、 且所述保护通道的信号强度与所述工作通道 的信号强度的差值达 'J预定的倒换阔值。
较佳的, 所述信号强度包括光功率值;
所述预定的倒换阔值为相对光功率阔值。
较佳的, 上述方法还包括:
当检测到的所述工作通道和保护通道的信号强度均大于预定的阔值时, 判定所述工作通道和保护通道均工作正常。
较佳的, 所述倒换触发条件还包括:
所述工作通道的信号强度小于预定的阔值、 且所述保护通道的信号强度 大于预定的阔值。
较佳的, 所述方法还包括:
检测到发送端无光信号时, 则不执行任何倒换。
本发明还提供了一种光网络自动保护倒换装置, 所述装置包括: 检测模块, 其设置为: 检测光网络的工作通道和保护通道的信号强度; 第一比较单元, 其设置为: 判断所述工作通道和所述保护通道是否工作 正常;
第二比较单元, 其设置为: 在光网络的工作通道和保护通道均工作正常 时, 对检测到的所述工作通道和所述保护通道的信号强度进行比较; 以及 控制模块, 其设置为: 根据所述第二比较单元的比较结果, 在满足倒换 触发条件时, 执行倒换。
较佳的, 所述控制模块是设置为根据所述第二比较单元的比较结果, 判 断是否满足如下倒换触发条件: 所述保护通道的信号强度大于所述工作通道 的信号强度、 且所述保护通道的信号强度与所述工作通道的信号强度的差值 达到预定的倒换阔值;
其中, 所述信号强度包括光功率值; 所述预定的倒换阔值为相对光功率 阔值。
较佳的, 所述第一比较单元是设置为通过以下方式判断所述工作通道和 保护通道是否工作正常:
当检测到的所述工作通道和保护通道的信号强度均大于预定的阔值时, 判定所述工作通道和保护通道均工作正常。
较佳的, 所述控制模块还设置为根据所述第一比较单元的判断结果, 判 断是否满足如下倒换触发条件: 所述工作通道的信号强度小于预定的阔值、 且所述保护通道的信号强度大于预定的阔值。
较佳的, 所述检测模块还设置为检测发送端是否无光信号;
所述控制模块还设置为如果检测到发送端无光信号,则不执行任何倒换。 上述方案通过设置两个比较单元, 第一比较单元完成两通道光功率值与 光功率阔值的比较, 用于检测工作通道和保护通道是否工作正常, 第二比较 通道性能对比, 并在保护通道的功率值超出工作通道达到触发条件时, 实现 工作通道到保护通道的自动倒换。 同时, 通过高速 A/D单元完成对光功率值 的釆样, 与比较单元电路互为补充。 此外, 还在发送单元对进入发送单元的 光功率进行监测, 如果进入发送单元的光功率低于正常值, 则说明被保护线 路的上游发生了故障, 则本保护段将不再执行任何倒换动作。 附图概述
此处所说明的附图用来提供对本发明实施方式的进一步理解, 构成本申 请的一部分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对 本发明的不当限定。 在附图中:
图 1为光网络自动保护倒换原理示意图;
图 2为本发明实施例的光网络自动保护倒换装置的组成示意图; 图 3为本发明应用示例的光网络自动保护倒换装置的组成示意图。 本发明的较佳实施方式
本发明的实施方式提供一种光网络自动保护倒换机制: 在工作通道和保 护通道均正常的情况下, 接收端对两个通道的性能进行检测和比较, 并自适 应地选择其中性能较优的通道作为工作通道, 即, 如果保护通道的性能要好 于工作通道很多, 则执行倒换。
以下将结合附图及具体实施例对本发明的实施方式作进一步详细描述。 需要说明的是, 在不冲突的情况下, 本申请中的实施例及实施例中的特征可 以相互任意组合。
本发明实施例的光网络自动保护倒换方法, 釆用如下技术方案: 分别检测光网络的工作通道和保护通道的信号强度;
根据检测到的所述工作通道和所述保护通道的信号强度, 在满足倒换触 发条件时, 执行倒换。
其中, 所述倒换触发条件包括:
所述工作通道和保护通道均工作正常时, 所述保护通道的信号强度大于 所述工作通道的信号强度, 且所述保护通道的信号强度与所述工作通道的信 号强度的差值达到预定的倒换阔值。
较佳的, 所述信号强度包括光功率值;
所述预定的倒换阔值为相对光功率阔值。
较佳的, 通过以下方式判断所述工作通道和保护通道是否工作正常: 当检测到的所述工作通道和保护通道的信号强度均大于预定的阔值时, 判定所述工作通道和保护通道均工作正常。
较佳的, 所述倒换触发条件还包括:
所述工作通道的信号强度小于预定的阔值, 且所述保护通道的信号强度 大于预定的阔值。
较佳的, 所述方法还包括:
检测到发送端无光信号时, 则不执行任何倒换。 如图 2所示, 本发明实施例的光网络自动保护倒换装置主要包括: 检测 模块、 第一比较单元、 第二比较单元和控制模块, 以及高速釆集单元。
其中, 检测模块设置为检测工作通道和保护通道的信号强度, 如光功率 值等。
第一比较单元设置为完成两个通道光功率值与阔值的比较, 如果高于阔 值, 则判断该通道工作正常, 否则, 判断该通道工作异常。 当判断出工作通 道异常而保护通道正常时, 则控制模块执行倒换, 控制接收单元选择保护通 道接收;
第二比较单元则设置为完成两通道差值与相对阔值的比较, 如果判断出 工作通道性能劣化, 且满足倒换触发条件(例如工作通道光功率较低且与保 护通道的差值大于光功率阔值) , 则此时控制模块也将执行倒换, 控制接收 单元选择保护通道接收。 可以看出, 第二比较单元的比较结果仅在第一比较 单元判断两通道均工作正常的条件下有效。
高速釆集单元设置为完成对光功率的釆样和计算, 该部分和比较单元相 互补充, 提高系统的生存能力和可靠性。
此外, 检测模块还设置为检测发送端是否无光信号, 如果执行检测到无 光的信号, 则不执行任何倒换。
图 3示出了本发明应用示例的光网络自动保护倒换装置, 如图 3所示, 检测模块用于检测通道光功率值, 例如可釆用 5/95耦合器检测 5%的信号的 光功率。 本示例的检测模块包括第一检测单元和第二检测单元, 其中第一检 测单元用于检测工作通道的光功率值; 第二检测单元用于检测保护通道的光 功率值。
参见图 3 , 本示例中, 第一比较单元由比较器和光功率阔值基准组成, 第二比较单元由减法器、 比较器和相对光功率阔值基准组成。 第一比较单元设置为, 通过比较器判断检测到的光功率值是否大于预定 的光功率阔值, 来判断所述工作通道和保护通道是否工作正常, 并发送标识 信号至控制模块, 将判断结果输出给控制模块, 由控制模块进行判断是否满 足倒换触发条件, 如满足, 例如工作通道故障使光功率值低于光功率阔值而 保护通道正常, 则控制接收单元执行倒换。
第二比较单元设置为, 在光网络的工作通道和保护通道均工作正常时, 对检测到的所述工作通道和所述保护通道的信号强度进行比较, 并发出标识 信号, 将比较结果输出给控制模块, 由控制模块判断是否满足切换触发条件: 如果工作通道和保护通道均在光功率阈值以上, 而工作通道光功率值较低且 与保护通道光功率值之差大于相对光功率阔值, 则控制模块将控制接收单元 执行倒换; 如果工作通道光功率值较低但工作通道光功率值与保护通道光功 率值之差小于相对光功率阔值, 或者, 工作通道的光功率值大于保护通道的 光功率值, 则控制模块将不执行倒换。
此外, 优选的, 检测模块还可以检测发送端是否无光信号, 如果是, 则 发出无光标识信号至控制模块; 控制模块在执行任何倒换时均需要确认是否 收到来自检测单元发出的无光标识信号, 如果收到, 则不执行任何倒换。
高速釆集单元可由高速 A/D模块实现, 其设置在检测模块和控制模块之 间, 用于将模拟信号转换为数字信号, 输出至控制模块, 控制模块收到高速 AD的信号后,利用软件计算实现工作通道和保护通道工作是否工作正常的判 断, 与硬件比较电路相互补充。 该高速 A/D模块除完成光功率检测, 上报网 管外, 还可与比较单元相互补充, 互为备份。
以上仅为本发明的优选实施案例而已, 并不用于限制本发明, 本发明还 可有其他多种实施例, 在不背离本发明精神及其实质的情况下, 熟悉本领域 的技术人员可根据本发明做出各种相应的改变和变形, 但这些相应的改变和 变形都应属于本发明所附的权利要求的保护范围。
显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布 在多个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程 序代码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 并 且在某些情况下, 可以以不同于此处的顺序执行所示出或描述的步骤, 或者 将它们分别制作成各个集成电路模块, 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样, 本发明不限制于任何特定的硬件和软件 结合。
工业实用性
上述实施方式通过设置两个比较单元, 第一比较单元完成两通道光功率 值与光功率阔值的比较, 用于检测工作通道和保护通道是否工作正常, 第二 保护通道性能对比, 并在保护通道的功率值超出工作通道达到触发条件时, 实现工作通道到保护通道的自动倒换。 同时, 通过高速 A/D单元完成对光功 率值的釆样, 与比较单元电路互为补充。 此外, 还在发送单元对进入发送单 元的光功率进行监测, 如果进入发送单元的光功率低于正常值, 则说明被保 护线路的上游发生了故障, 则本保护段将不再执行任何倒换动作。

Claims

权 利 要 求 书
1、 一种光网络自动保护倒换方法, 所述方法包括:
分别检测光网络的工作通道和保护通道的信号强度; 以及
根据检测到的所述工作通道和所述保护通道的信号强度, 在满足倒换触 发条件时, 执行倒换。
2、 如权利要求 1所述的方法, 其中, 所述倒换触发条件包括: 所述工作通道和所述保护通道均工作正常时, 所述保护通道的信号强度 大于所述工作通道的信号强度、 且所述保护通道的信号强度与所述工作通道 的信号强度的差值达 'J预定的倒换阔值。
3、 如权利要求 1或 2所述的方法, 其中,
所述信号强度包括光功率值;
所述预定的倒换阔值为相对光功率阔值。
4、 如权利要求 2所述的方法, 所述方法还包括:
当检测到的所述工作通道和保护通道的信号强度均大于预定的阔值时, 判定所述工作通道和保护通道均工作正常。
5、 如权利要求 4所述的方法, 其中, 所述倒换触发条件还包括: 所述工作通道的信号强度小于预定的阔值、 且所述保护通道的信号强度 大于预定的阔值。
6、 如权利要求 1、 2或 4之任一项所述的方法, 所述方法还包括: 检测到发送端无光信号时, 则不执行任何倒换。
7、 一种光网络自动保护倒换装置, 所述装置包括:
检测模块, 其设置为: 检测光网络的工作通道和保护通道的信号强度; 第一比较单元, 其设置为: 判断所述工作通道和所述保护通道是否工作 正常;
第二比较单元, 其设置为: 在光网络的工作通道和保护通道均工作正常 时, 对检测到的所述工作通道和所述保护通道的信号强度进行比较; 以及 控制模块, 其设置为: 根据所述第二比较单元的比较结果, 在满足倒换 触发条件时, 执行倒换。
8、 如权利要求 7所述的装置, 其中,
所述控制模块是设置为根据所述第二比较单元的比较结果, 判断是否满 足如下倒换触发条件: 所述保护通道的信号强度大于所述工作通道的信号强 度、 且所述保护通道的信号强度与所述工作通道的信号强度的差值达到预定 的倒换阔值;
其中, 所述信号强度包括光功率值; 所述预定的倒换阔值为相对光功率 阔值。
9、 如权利要求 7所述的装置, 其中,
所述第一比较单元是设置为通过以下方式判断所述工作通道和保护通道 是否工作正常:
当检测到的所述工作通道和保护通道的信号强度均大于预定的阔值时, 判定所述工作通道和保护通道均工作正常。
10、 如权利要求 9所述的装置, 其中,
所述控制模块还设置为根据所述第一比较单元的判断结果, 判断是否满 足如下倒换触发条件: 所述工作通道的信号强度小于预定的阔值、 且所述保 护通道的信号强度大于预定的阔值。
11、 如权利要求 7、 8、 9或 10之任一项所述的装置, 其中,
所述检测模块还设置为检测发送端是否无光信号;
所述控制模块还设置为: 如果检测到发送端无光信号, 则不执行任何倒 换。
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